<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1 {
            width: 100px;
            height: 100px;
            background: red;
            display: block;
        }

        .box2 {
            width: 100px;
            height: 100px;
            background: blue;
            display: none;
        }

        .box3 {
            width: 100px;
            height: 100px;
            background: yellow;
            display: none;
        }
    </style>
</head>

<body>
    <div class="contaner1">
        <button>按钮一</button>
        <button>按钮二</button>
        <button>按钮三</button>
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
    </div>

    <div class="contaner2">
        <button>按钮一</button>
        <button>按钮二</button>
        <button>按钮三</button>
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
    </div>
    <script>
        // 面向对象：简单的程序 面向过程；
        // 面向对象：需求复杂(属性方法比较多) 涉及对象较多 。
        // 需求一：写一个选项卡；

      
        function tab(btns,divs) {
            btns.forEach((btn, key) => {
                btn.onclick = function () {
                    divs.forEach((div, index) => {
                        if (key == index) {
                            div.style.display = "block";
                        } else {
                            div.style.display = "none";
                        }
                    })
                }
            })
        }

        var btns = document.querySelectorAll(".contaner1 button");
        var divs = document.querySelectorAll(".contaner1 div");
        tab(btns,divs);

        var btns2 = document.querySelectorAll(".contaner2 button");
        var divs2 = document.querySelectorAll(".contaner2 div");

        tab(btns2,divs2);



    </script>
</body>

</html>